I believe the answer is C) a man older than twenty
I HATE THE DENTIST!!! Are u going? Good luck soldier.
It is important that students get the right amount of lunch and good lunch because the better the nutrients of the food the better the children's brain will work they will also have more energy to continue through out the day opposed to if they got a small unhealthy lunch would mostly likely cause children to be unfocused, tired and unwilling to do thing for school or class.
B: Go places where smoking isn't allowed.
All the other options would not work because the first one could possibly pressure the person who is trying not to smoke to smoke, C would not work because that would provide temptation, and D would not work because A and C would not work